Copy makes a copy of provided snapshot.

Empty returns an empty state snapshot.

ErrConflictingNonce means ApplyTx encountered a transaction with a nonce already in the blockchain state.

ErrEmptyState means ApplyTx was called on an uninitialized blockchain state.

ErrNonceReference means a nonce referenced a non-recent, non-initial block ID.

ErrPrevout means a transaction tried to input a contract with an unknown ID.

ErrUnfinalized means a transaction with no finalize instruction is being applied to a snapshot.

Snapshot represents a snapshot of the blockchain, including the contracts tree and issuance memory.

Snapshot contains a blockchain's state.